CIA agent Emerson Kent (John Cusack John Cusack) is often sent to perform some dangerous tasks of licking blood, during which the psychological pressure can be imagined. In one mission, the death of a strange girl made his psychological line of defense begin to collapse. He was then transferred from the field to an old US military base in England, an intelligence station rejected by the US government, where he served as a bodyguard for high-level cryptographer Catherine (Marlene Ackerman Malin Akerman). Life in a remote town was dull and mundane, with the occasional shadow of the incident, but Emerson's nervousness was slowly easing. Who knew that one day, he and Catherine were attacked by mysterious people. Emerson reported the situation to headquarters and was ordered to evacuate and Catherine. In a remote intelligence station shrouded in fog, the lives of Emerson and Catherine hang by a thread.